Final answer:
The 'fatal bellman' is a metaphorical figure from Shakespeare's Macbeth, symbolizing impending doom, and not an actual animal.
Step-by-step explanation:
The animal referred to as the "fatal bellman" is not actually an animal but a metaphorical figure mentioned in Shakespeare's play, Macbeth. It refers to the owl that shrieks in Act II, Scene II, foreshadowing Duncan's death. Contrary to the figures provided, which include animals like the fire-bellied toad known for its aposematic coloration signaling its toxicity, and historical accounts of species like Steller's sea cow, the term "fatal bellman" does not denote an animal species but a symbolic element used in literature.